Asymmetric arms maximise visibility in hot-electron interferometers
arXiv:2104.01653 · doi:10.1103/PhysRevB.104.035436
Abstract
We consider theoretically an electronic Mach-Zehnder interferometer constructed from quantum Hall edge channels and quantum point contacts, fed with single electrons from a dynamic quantum dot source. By considering the energy dependence of the edge-channel guide centres, we give an account of the phase averaging in this set up that is particularly relevant for the short, high-energy wavepackets injected by this type of electron source. We present both analytic and numerical results for the energy-dependent arrival time distributions of the electrons and also give an analysis of the delay times associated with the quantum point contacts and their effects on the interference patterns. A key finding is that, contrary to expectation, maximum visibility requires the interferometer arms to be different in length, with an offset of up to a micron for typical parameters. By designing interferometers that incorporate this asymmetry in their geometry, phase-averaging effects can be overcome such that visibility is only limited by other incoherent mechanisms.
arXiv comment12 pages; 6 figures
References in corpus (35)
- An Electronic Mach-Zehnder Interferometer
- An On-Demand Coherent Single Electron Source
- Coherence and Indistinguishability of Single Electrons Emitted by Independent Sources
- Violation of Kirchhoff's Laws for a Coherent RC Circuit
- Towards a quantum representation of the ampere using single electron pumps
- Direct measurement of the coherence length of edge states in the Integer Quantum Hall Regime
- Single-parameter non-adiabatic quantized charge pumping
- Electron quantum optics in ballistic chiral conductors
- Electron quantum optics : partitioning electrons one by one
- Dephasing in the electronic Mach-Zehnder interferometer at filling factor 2
- Clock-controlled emission of single-electron wavepackets in a solid-state circuit
- Non-adiabatic quantized charge pumping with tunable-barrier quantum dots: a review of current progress
- Hong-Ou-Mandel experiment for temporal investigation of single electron fractionalization
- Decoherence and single electron charging in an electronic Mach-Zehnder interferometer
- Electron quantum optics in quantum Hall edge channels
- Unexpected finite-bias visibility dependence in an electronic Mach Zehnder interferometer
- Coherence of Single Electron Sources from Mach-Zehnder Interferometry
- Time-of-Flight Measurements of Single-Electron Wave Packets in Quantum-Hall Edge States
- Visibility of current and shot noise in electrical Mach-Zehnder and Hanbury Brown Twiss interferometers
- Noise dephasing in the edge states of the Integer Quantum Hall regime
- Tuning decoherence with a voltage probe
- Decoherence and relaxation of single electron excitations in quantum Hall edge channels
- Nonequilibrium Dephasing in an Electronic Mach-Zehnder Interferometer
- The Behavior of Electronic Interferometers in the Non-Linear Regime
- Effects of dephasing on shot-noise in an electronic Mach-Zehnder interferometer
- Measurement and control of electron wave packets from a single-electron source
- Ultrafast Emission and Detection of a Single-Electron Gaussian Wave Packet: A Theoretical Study
- Robust quantum coherence above the Fermi sea
- LO-phonon emission rate of hot electrons from an on-demand single-electron source in a GaAs/AlGaAs heterostructure
- Spectroscopic study on hot-electron transport in a quantum Hall edge channel
- Phonon emission and arrival times of electrons from a single-electron source
- Energy relaxation in hot electron quantum optics via acoustic and optical phonon emission
- Dephasing by electron-electron interactions in a ballistic Mach-Zehnder interferometer
- Time-dependent simulation and analytical modelling of electronic Mach-Zehnder interferometry with edge-states wave packets
- Mitigating decoherence in hot electron interferometry